DROP TABLE [dbo].[CauHoi]
DROP TABLE [dbo].[Khoi]
DROP TABLE [dbo].[HocPhan]
DROP TABLE [dbo].[DonViPhuTrach]

DROP TABLE [dbo].[DeInRa]
DROP TABLE [dbo].[HocKy]
DROP TABLE [dbo].[NamHoc]
DROP TABLE [dbo].[NguoiSuDung]